Antiparaffin sucker rod



Nov. 9, 1948. w. R. CRALL ANTIPARAFFIN SUCKER ROD Filed. Dec. 31, 1946 IINVENTOR. K 71112222: .B- Ufa/l gZ/W *7 In: ATTORNEY Patented Nov. 9,1948 2,453,199.: ANTIPARAFFIN SUCKER ROD William R. Crall, Pampa,v

istratrix of said William Tex.; Irma Crall admin- B. Crall, deceasedApplication December 31, 1946, Serial No. 719.442 1.01am. (01.166-18)This invention relates to a paraffin remover of the type disclosed inLetters Patent of the United States No. 1,639,660 issued August 23,1927, to A. E. Neumeyer, and more particularly to a type of tubingcleaner especially adapted for continu-- ous scraping and defusingparaffin accumulating on the inside of the well casing while well ispumping.

In most paraffin base crude oil wells an accumulation of paraffin on thewell tubing walls tends to retard the flow of oil to the surface and iflet go such an accumulation will eventually stop the pump sucker rodfrom working up and down. The wells then have to be pulled and theparaffin steamed from both the sucker rod sections and the tubing, thusentailing great expense to the operation of such wells.

The primary object of this invention is the removal of paraiiin whilethe well is operating and to put into solution the paraffin accumulationwhile the pumps are in operation.

Another object is to keep the paraffin in suspension in the liquid sothat it may be pumped to the surface.

The above and other objects may be attained by employing this inventionwhich embodies among its features a length of pump sucker rod providedat longitudinally spaced intervals with a spiral scraper each comprisinga strip of flat sheet metal of a width suflicient to contact the wall ofa well tubing bent into spiral form and welded adjacent opposite ends toits respective sucker rod length.

Other features embody reversing the spiral of adjacent scrapers so thatthe tendency of one blade to rotate the sucker rod length throughcontact with the well tubing will be counteracted by the adjacent blade.

In the drawings- Figure 1 is a typical view representing a longitudinalsection through a well tubing showing a portion of a pump sucker rodtherein equipped with a set of my improved scrapers,

Figure 2 is a transverse sectional View taken substantially along theline 22 of Figure 1,

Figure 3 is a transverse sectional view taken substantially along theline 3-3 of Figure 1, and

Figure 4 is a similar view taken along the line fi--4 of Figure 1.

Referring to the drawings in detail a well tubing H) has working thereinin a conventional manner a pump sucker rod designated generally ll ofconventional form which is formed of a plurality of sucker rod lengthsor sections l2 each of which is formed at opposite ends with a hub 13.The hub at one end of each rod length 12 is formed with an axialinternally screw threaded socket M for the reception of an axialexternally screw threaded stud it formed on the end of the hub it of anadjacent rod length.

The construction recited thus far is all con-- ventional and is commonlyemployed in oil wells.

My invention embodies 1ongitudinally spaced spiral scrapers designatedgenerally 16 and I1 each comprising a fiat strip of metal E8 of a widththroughout its entire length equal to the space between the periphery ofthe sucker rod H and the Well casing 10. These strips are bent spirallyso that each extends around its respective sucker rod length l2 for 360to form a scraper blade. Each strip or blade is welded adjacent itsopposite ends as at l9 to its respective sucker rod length, but theportion of each strip or blade which lies between the ends is left freeof any attachment to the sucker rod. It will thus be seen that as thesucker rod 5 i reciprocates within the well tubing during the process ofpumping the well, vibration will be created in the scraper bladesthrough their contact with the tubing H1. It is to be noted that thescrapers l6 are all of the same spiral formation while adjacent scrapersIT spiral in a reverse direction. This is done so that the tendency ofthe blades 16 to rotate the sucker rod sections or lengths willcounteract the tendency of the blades H to turn the rod in the oppositedirection, and hence any tendency for one length of sucker rod tounscrew from an adjacent section will be overcome.

In use it will be understood that the spiral scrapers may be employedthroughout the entire length of the sucker rod and well tubing and thatadjacent scrapers are placed close enough together so that the area ofthe casing engaged by each scraper will. also be engaged by an adjacentscraper as the sucker rod is reciprocated during the pumping operation.In other words with each stroke of the sucker rod that part of thetubing being scraped by the scrapers 56 will also be engaged by ascraper ll. Due to the fact that the scrapers are anchored to the suckerrod lengths I2 only adjacent opposite ends it is obvious that not onlyis the strength of the sucker rod lengths preserved but the scraperblades I8 through their contact with the well tubing Ill will vibrateand thus agitate the liquid and effectively maintain the paraflin insuspension therein so that it will flow to the surface with the liquid.

While in the foregoing and described the preferred embodiment of thisinvention, it is to be understood that minor there has been shownchanges in the details of construction, combination and arrangement ofparts may be resorted to without departing from the spirit and scope ofthe invention as claimed.

What is claimed is:

For use in a well tubing, a jointed pump sucker rod reciprocatingaxially of the well tubing and extending substantially throughout theentire length thereof, a parafiin remover for preventing the deposit ofparaffin on the Well tubing substantially throughout its lengthcomprising a plurality of spiral strip metal scraper blades each havinga width sufiicient to bridge the space between the outer periphery ofthe rod and the inner periphery of the tubing and encircling each lengthof sucker rod and being spaced from each other a dista-nce'less than thereciprocating stroke of the rod; each blade having a spiral about therod of substantially 360 only, the spirals of every other blade betweenthe joints thereofextending in opposite directions, each bladecontacting the Well tubing throughout substantially its entire length,each blade adjacent its opposite ends being rigidly secured to thesucker rod length and the intermediate portions of the blades spacedfrom and being free from attachment to the rod for longitudinal flexingmovement with relation to their respective sucker rod lengths.

WILLIAM R. CRALL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Name Date Neumeyer Aug. 23, 1937 Swinford June 16,1931 Number Bostic Dec. 20, 1932

